package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.common.MyBaseContext;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;



    /**
     * 用户下单
     * @param orders
     */
    @Transactional
    public void submit(Orders orders) {

        //第一步：准备数据
        //1.获得当前用户id
        Long userId = MyBaseContext.getCurrentId();

        //2.查询当前用户的购物车数据
        //select * from shopping_cart where user_id=1
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId,userId);

        List<ShoppingCart> shoppingCarts = shoppingCartService.list(wrapper);

        if(shoppingCarts == null || shoppingCarts.size() == 0){
            throw new CustomException("购物车为空，不能下单");
        }

        //查询用户数据
        User user = userService.getById(userId);

        //查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if(addressBook == null){
            throw new CustomException("用户地址信息有误，不能下单");
        }


        //第二步：封装并插入数据

        //生成订单号：雪花算法
        long orderId = IdWorker.getId();

        //3.向订单表插入数据，一条数据
        //原子类：主要用来解决并发访问的问题
        AtomicInteger amount = new AtomicInteger(0);

        //匿名内部类
        /*shoppingCarts.stream().map(new SFunction<ShoppingCart, Object>() {
            @Override
            public Object apply(ShoppingCart shoppingCart) {
                return null;
            }
        }).collect(Collectors.toList());*/


        //遍历购物车：计算总金额&组装订单明细数据
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);  //订单编号
            orderDetail.setNumber(item.getNumber());  //订单数量
            orderDetail.setDishFlavor(item.getDishFlavor()); //口味信息
            orderDetail.setDishId(item.getDishId());  //菜品ID
            orderDetail.setSetmealId(item.getSetmealId());  //套餐id
            orderDetail.setName(item.getName());  //菜品名字
            orderDetail.setImage(item.getImage());  //菜品图片
            orderDetail.setAmount(item.getAmount());  //菜品单价
            //计算总价
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());

            return orderDetail;
        }).collect(Collectors.toList());



        //封装订单基本信息
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());  //下单时间
        orders.setCheckoutTime(LocalDateTime.now());  //支付时间
        orders.setStatus(2);  //订单状态
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);  //下单人ID
        orders.setNumber(String.valueOf(orderId));  //订单号
        orders.setUserName("客户");   //用户名:用户名未维护，所以应该为空，可以设置一个默认的
        orders.setConsignee(addressBook.getConsignee());  //收货
        orders.setPhone(addressBook.getPhone());  //联系电话
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //添加订单基本信息
        this.save(orders);

        //4.向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //5.清空购物车数据
        //delete from shopping_cart where user_id=1
        shoppingCartService.remove(wrapper);
    }
}
